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d in (-oo:+oo)
d/3 = -5/6 // + -5/6
d/3-(-5/6) = 0
d/3+5/6 = 0
1/3*d+5/6 = 0 // - 5/6
1/3*d = -5/6 // : 1/3
d = -5/6/1/3
d = -5/2
d = -5/2
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